Buildings are seen covered in thick smog in New Delhi on Nov 7. Emissions of carbon dioxide (CO2) from fossil fuel use and industry are at an all-time high. To stabilise global temperature at any level, net CO2 emissions need to be reduced to zero.
* Physical effects of climate change are clearly felt across the world today; 2015 to 2019 are the five hottest years on record.
* Businesses are already vulnerable to short term disruption; longer term climate risks could upend business models.